Since many applications use a different axis for 'Up', these are axis conversions for
Forward and Up axes -- By mapping these to different axes you can convert rotations
between applications default up and forward axes.

Blender uses Y Forward, Z Up (since the front view looks along the +Y direction).
For example, its common for applications to use Y as the up axis, in that case -Z Forward, Y Up is needed.

Since many applications use a different axis for 'Up', these are axis conversion for these settings,
Forward and Up axes -- By mapping these to different axes you can convert rotations
between applications default up and forward axes.

Blender uses Y Forward, Z Up (since the front view looks along the +Y direction).
For example, it's common for applications to use Y as the up axis, in that case -Z Forward, Y Up is needed.

Selection Only

TODO.

Apply Modifiers

TODO.

Triangulate

TODO.

Normals

TODO.

Compress

TODO.

Hierarchy

TODO.

Named decorations

TODO.

H3D Extensions

TODO.

Scale

TODO.

Path Mode

When referencing paths in exported files you may want some control as to the method used since absolute paths
may only be correct on your own system. Relative paths on the other hand are more portable
but mean that you have to keep your files grouped when moving about on your local file system.
In some cases the path doesn't matter since the target application will search
a set of predefined paths anyway so you have the option to strip the path too.

Auto:

Uses relative paths for files which are in a subdirectory of the exported location,
absolute for any directories outside that.

Absolute:

Uses full paths.

Relative:

Uses relative paths in every case (except when on a different drive on windows).